During one particular battle, Archer's great-grandfather's battalion was evacuating civilians, including a school full of children, from a war zone when they came under attack by the Augments.

To avoid adding to the collateral damage, Archer's great-grandfather called the Augment commander, and got him to agree to hold his fire long enough to evacuate the school.

In the short story "The Rules of War" from Strange New Worlds 9, the Augment commander was Stavos Keniclius while Archer's great-grandfather was given the name Nathan Archer (β). The story depicts the incident as having taken place in 1994.

These would-be astronauts, along with Shannon O'Donnel and LieutenantMcMillan, were in the same NASA class prior to 1999. They came up with the slogan "Next stop, Mars". In 1999, upon re-uniting with O'Donnel, former media relations man Gerald B. Moss asked her if she kept in touch with the others. O'Donnel admitted she didn't. Moss did, however, and had called a few of them the night before, including McMillan. (VOY: "11:59")

She mentioned this in a conversation with Mestral that year, adding that she'd thought he would help with money for Jack's collegeeducation. Seeming at a loss to understand why he would ignore his son as well as her, she apologized for her show of emotion, as she was usually better at hiding her feelings on the matter. (ENT: "Carbon Creek")

These three male Humans were members of an anti-government militia group in 1996, based outside of Phoenix, Arizona. When Butch and Porter, two members of this group, captured B'Elanna Torres and Chakotay and held them prisoner in their cellar, Tuvok and The Doctor came to rescue them. These three militia members armed themselves and tried to stop the rescue party but were unsuccessful. (VOY: "Future's End, Part II")

While passing these individuals, Chakotay and Janeway discussed what their ancestors were doing on Earth during that time. Janeway was not sure what her relatives were doing that far back in history, she commented as they passed the girl, for all she knew "she could be my great, great, great...great grandmother," prompting Chakotay to joke that "She does have your legs."
(VOY: "Future's End")

The store owner was played by Joe Knowland. In the novelization of Star Trek IV, the scene with the store owner was greatly expanded to include a lengthy conversation about whether or not the glasses were "hot" (stolen) to which Spock explained that the temperature of the glasses was the same as the room.

These Humans were part of the tour group at the Cetacean Institute in 1986 when Spock jumped into the whale tank to mind meld with the two whales George and Gracie. At the time, Doctor Gillian Taylor was showing the whales to the group and discussing whale song, noting that it was not known exactly what purpose the song served. (Star Trek IV: The Voyage Home)

All people in the tour were played by background performers who received no credit for their appearance.

This cafe owner was seen by McCoy, Scotty, and Sulu downtown in San Francisco in 1986, while looking for plexiglass for the whale tank. He left the cafe through the backdoor and was shouted immediatly by a woman who followed him through the door. (Star Trek IV: The Voyage Home)

This woman followed the cafe owner through the backdoor of their house and shouted after him. Scotty, McCoy, and Sulu witnessed this situation while in downtown San Francisco. (Star Trek IV: The Voyage Home)

When Kira Nerys and Miles O'Brien were searching for Benjamin Sisko, Jadzia Dax, and Julian Bashir in San Francisco in 1967, they were greeted by two hippies who offered them flowers and exchanged "peace" signs. The two saw Kira and O'Brien transport away, an event to which the male hippie exclaimed "Wow!". (DS9: "Past Tense, Part II")

This unnamed passerby was encountered by Uhura and Pavel Chekov on a street in San Francisco, while the two were looking for the "nuclearwessels" at the naval base in Alameda. This passerby stopped to respond to Chekov's request, stating "Oh, I don't know if I know the answer to that. I think it's across the bay in Alameda," to which Chekov replied, "That's what I said. Alameda." (Star Trek IV: The Voyage Home)

This passerby was played by background actress Layla Sarakalo, who received no credit for her performance.

This punk was listening to the song "I Hate You" on a bus in San Francisco in 1986. James T. Kirk and Spock, who had traveled back in time, were annoyed by the loud rock music with Kirk telling the punk to "turn off that damn noise". When the punk instead gave Kirk the middle finger and turned the volume up, Spock administered a Vulcan nerve pinch and the unconscious punk fell on his radio, silencing the music, much to the joy of the rest of the bus passengers. (Star Trek IV: The Voyage Home)

The punk was played by Kirk Thatcher, who also happens to be the one performing "I Hate You". Thatcher has tweeted that the character's name was Krash. [2]

As a result of Kevin Feige being a fan of The Voyage Home, he offered Thatcher a chance to reprise his role somewhat in Spiderman: Homecoming. Unnamed Humans (20th century)

These three waiters also worked at the Italian restaurant, serving other patrons in 1986. Two bartenders can also be seen in the background, serving drinks to customers. (Star Trek IV: The Voyage Home)

The driver's car was hit in the back by Shannon O'Donnel's car after she asked for some information from a passerby and didn't pay attention. Unfortunately for him, Shannon's insurance had run out and he drove away without being compensated for the damage. (VOY: "11:59")

This woman was the wife of Henry Janeway and mother of Jason Janeway. She died when Jason was young, and as a result, he was unable to remember her very well by the year 2000. He told Shannon O'Donnel of her passing when she asked him where his mom was, and she expressed her condolences. (VOY: "11:59")

These three ambulance paramedics transported Benny Russell in an ambulance after Benny had a mental breakdown when the publishers of the magazine he wrote for refused to print his novel about a space station commanded by a black officer. (DS9: "Far Beyond the Stars")

A Haredi Jew was a resident in 1950s of New York City when Benny Russell, a science-fiction writer, was denied the right to publish his story of a black commander of a futuristic space station. (DS9: "Far Beyond the Stars")

Rodent was a homeless man living on the streets of New York in 1930. He met James T. Kirk and Spock in a soup kitchen run by Edith Keeler when Kirk and Spock were transported back in time by the Guardian of Forever. He told them that in order to eat, they would have to listen to Keeler preach, calling her Miss Goody Two Shoes. He started to refer to her in a sexual way but Kirk told him to be quiet. When Leonard McCoy was transported back, Rodent was accosted by McCoy who demanded to know what year it was. He accidentally killed himself with McCoy's phaser. (TOS: "The City on the Edge of Forever")

In the aired script, the Guardian of Forever stated that if Kirk was successful in his mission, the timeline would be restored as though none of them had gone through. This could mean that Rodent was restored to life eventually or it could mean that Rodent's death has no impact on the timeline.

An article on the time-travel implications of this episode jokingly postulated that Rodent was the father of Gene Roddenberry, altering Roddenberry's childhood negatively but permitting Kirk's future to exist by removing Star Trek from the popular-culture lexicon. (The Best of Trek)

This truck driver was behind the wheel of the truck that struck and killed Edith Keeler, an event that restored the timeline. McCoy attempted to save her, but was stopped by Kirk. (TOS: "The City on the Edge of Forever")

Since the Army did not have concrete reason to hold, CaptainWainwright voiced his concerns with GeneralRex Denning regarding how much longer they could keep him in there. Despite this, Denning ordered Wainwright to keep the farmer there until further notice. (DS9: "Little Green Men")

These peace movement supporters participated in a peace protest, in an alternate timeline created by Doctor McCoy saving Edith Keeler's life in 1930. They were seen by Kirk and Spock via images recorded from the Guardian of Forever. (TOS: "The City on the Edge of Forever")

The protestors were "played" by unknown people, who appeared via stock footage.